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This building was completed this spring I believe, possibly late last winter. I'm sure it's had some run time on it in the heating mode, but not too much, so this cold snap we had was likely one of the 1st.

The company that installed it does good work and their service guys are pretty dang good too, so I doubt it was anything fouled up by a poor tech. Perhaps it was just one of those things.

York

Had a York start on fire on me last winter in heat start up mode unit running fine everything looked cool.contacted york and was told they had an issue with 6 ton and less with high limit not opening and catching unit on fire since then if you order new high limit it comes with aux limit and new harness
York released no service letter that i know of

York

Found out about the high limit for york tech service after unit fired up the bad thing was it was at a dunbar armored car sight with no windows talk about a customer having a fit then we proceeded to convince them that they needed to replace the unit

hey mr builder......

...and the heat caused an electrical short near that compressor contactor, and the current was below the protection value, but enough to add a lot of electrical burning.

you got there first with what i was gonna say , the last time i saw anything like that was when an electrical contractor ran like a 200 amp service to a 15 t rooftop with full sized fuses in it and it just burned so bad the brass contacts in the contactors melted an hardened like little raindrops inside the cabinet......Jack